eac3to - audio conversion tool

[Snowknight26]

Originally Posted by nautilus7

You can use delaycut to spot the position and how big the problem is. If it's 1-2 frames you can use a hex editor to edit (correct) the dts frame header, so it can be processed by eac3to. PM me here or at HD... if you want any kind of help.

What I'm saying is, delaycut doesn't handle DTS-HD MA, so eac3to's suggestion to use delaycut on that track is pointless.

[nautilus7]

Originally Posted by Snowknight26

What I'm saying is, delaycut doesn't handle DTS-HD MA, so eac3to's suggestion to use delaycut on that track is pointless.

Yeah, sorry... I read your post too quickly!

[Thunderbolt8]

madshi could it be possible that there are different kind of chapters (for HD DVDs)? there seem to be no chapters displayed for the eagles live HD DVD, although some internet page said that disc is supposed to have 29 ones.

[nautilus7]

can you post/upload the.xpl file?

[Thunderbolt8]

nvm, now it works doh -.-
do you happen to know if those chapter files have a special file structure which is recognized by mkvmerge, or would it be the same if I just create a new random file and copy & paste the info into it?

[Yraen]

Just use eac3to and extract only the chapters file. Copy and paste won't work, not from the .xpl file.

[Beastie Boy]

I wanted to create a 640kb/s AC3 file from a TrueHD track on Bluray. Here is my log file:

eac3to v2.46
command line: "C:\Program Files\eAC3to\eac3to.exe" "H:\BDMV\STREAM\00011.m2ts" 4: "D:\HD_Working\REE.ac3"
------------------------------------------------------------------------------
M2TS, 2 video tracks, 8 audio tracks, 1:34:06
1: Chapters, 16 chapters
2: h264/AVC, 1080p24 /1.001 (16:9)
3: h264/AVC, 480p24 /1.001 (20:11)
4: TrueHD/AC3, English, 5.1 channels, 48khz
5: AC3, Czech, 5.1 channels, 448kbit/s, 48khz, dialnorm: -30dB
6: AC3, Hungarian, 5.1 channels, 448kbit/s, 48khz, dialnorm: -29dB
7: AC3, Hindi, 5.1 channels, 448kbit/s, 48khz, dialnorm: -28dB
8: AC3, Polish, 5.1 channels, 448kbit/s, 48khz, dialnorm: -27dB
9: AC3, English, 5.1 channels, 448kbit/s, 48khz, dialnorm: -28dB
10: AC3, English, 2.0 channels, 192kbit/s, 48khz, dialnorm: -29dB
11: E-AC3, English, 1.0 channels, 96kbit/s, 48khz
[a04] Extracting audio track number 4...
[a04] Extracting AC3 stream...
[a04] Creating file "D:\HD_Working\REE.ac3"...
Video track 2 contains 135360 frames.
Video track 3 contains 135360 frames.
eac3to processing took 34 minutes, 29 seconds.

It seems eac3to has extracted the core 448kbit track instead of encoding a new one from the lossless data, and I can confirm the the output is 448kbit..

Is there anyway to go straight from Bluray TrueHD to 640kbit AC3? Perhaps the -core switch could be used to specify that the core AC3 track is required.

Cheers, Beastie.

[nautilus7]

It must be the 1st blu-ray with TrueHD/AC3 stream that the AC3 part isn't 640 kbps! Which movie is it?

Since you need a 640 kbps one, try:

eac3to "H:\BDMV\STREAM\00011.m2ts" 4: "D:\HD_Working\REE.ac3" -640

and if that doesn't work, do it in 2 steps:

eac3to "H:\BDMV\STREAM\00011.m2ts" 4: "D:\HD_Working\REE.thd"

eac3to ree.thd ree.ac3

[Beastie Boy]

Originally Posted by nautilus7

It must be the 1st blu-ray with TrueHD/AC3 stream that the AC3 part isn't 640 kbps! Which movie is it?

Resident Evil Extinction. I'm currently creating a 16bit wav file usind -down16, which I will then transcode to AC3. One thing I notice is that the output file is called REE.24bit.wav despite the output being forced to 16bit. Not a big deal I know, but I thought I would mention it.

Cheers, Beastie.

Edit: On completion, the file is simply called REE.wav anyway.

[Thunderbolt8]

have now encountered a DTS-ES track for the first time, what do I have to enter as file ending when I want to keep the track 100% original? just .dts as the same for normal .dts tracks? or should I just use the -demux command? I dont want to decode it accidently to something of lower quality

[nautilus7]

Originally Posted by Beastie Boy

Resident Evil Extinction. I'm currently creating a 16bit wav file using -down16, which I will then transcode to AC3. One thing I notice is that the output file is called REE.24bit.wav despite the output being forced to 16bit. Not a big deal I know, but I thought I would mention it.

Cheers, Beastie.

Edit: On completion, the file is simply called REE.wav anyway.

Why did you decode to wav and why did you reduce the bit depth? The command lines i suggested you will produce a better (since you 'll use the full 24 bit info from the TrueHD) and faster since you do Truehd decoding and encoding AC3 in 1 step.

[nautilus7]

Originally Posted by Thunderbolt8

have now encountered a DTS-ES track for the first time, what do I have to enter as file ending when I want to keep the track 100% original? just .dts as the same for normal .dts tracks? or should I just use the -demux command? I dont want to decode it accidentally to something of lower quality

.dts is fine.

[banker_rishad]

Madshi doesnot know anything

[Beastie Boy]

Originally Posted by nautilus7

Why did you decode to wav and why did you reduce the bit depth? The command lines i suggested you will produce a better (since you 'll use the full 24 bit info from the TrueHD) and faster since you do Truehd decoding and encoding AC3 in 1 step.

I was toying with the idea of just keeping the wav and muxing that into my TS file. I decoded to wav to see what the resultant file size would be. I don't think the AC3 encoding process would retain 24bit (or even 20bit) information anyway, so I figured there would be no quality difference.

Cheers, Beastie.

[Geleodor]

Snowknight26 it looks like there is a 3-frames gap for audio in Kingdom of Heaven, between first and second part...at leest audio seems to be in sync in second part when -125ms delay put

[nautilus7]

Originally Posted by banker_rishad

Madshi doesnot know anything

What?

[Bluestraw]

Originally Posted by banker_rishad

Madshi doesnot know anything

You're probably right - he seems to know EVERYTHING

[BLKMGK]

Weird error on National Treasure 2 ->

D:\Video\eac3to>eac3to x:\BDMV\STREAm\00429.m2ts 1: f:\nat\chap.txt 2: f:\naT\nat-vid.mkv 4: f:\nat\nat-aud.ac3 -640 -libav
This doesn't seem to be a valid DTS file.
M2TS, 2 video tracks, 7 audio tracks, 2:04:32
1: Chapters, 19 chapters
2: h264/AVC, 1080p24 /1.001 (16:9)
3: h264/AVC, 480p24 /1.001 (20:11)
4: TrueHD/AC3, English, 5.1 channels, 48khz
5: AC3, English, 2.0 channels, 192kbit/s, 48khz
6: AC3, French, 5.1 channels, 640kbit/s, 48khz
7: AC3, Spanish, 5.1 channels, 640kbit/s, 48khz
8: AC3, Portuguese, 5.1 channels, 640kbit/s, 48khz
9: AC3, Thai, 5.1 channels, 640kbit/s, 48khz
10: AC3, English, 2.0 channels, 192kbit/s, 48khz, dialnorm: -27dB
Creating file "f:\nat\chap.txt"...
[v02] Extracting video track number 2...
[a04] Extracting audio track number 4...
[a04] Extracting TrueHD stream...
[a04] Encoding AC3...
[v02] Muxing video to Matroska...
[a04] Creating file "f:\nat\nat-aud.ac3"...
------------------

Appears to be decoding correctly right now, will report back if I see anything else odd. Is a 2hour movie so it will take me awhile to compress but thought I'd warn folks. <shrug>

P.S Don't feed the Trolls

[boykster]

BLKMGK: are you referring to the

This doesn't seem to be a valid DTS file.

as the wierd error? I saw something similar when I processed Untraceable

C:\__movies>eac3to h: 1)
This doesn't seem to be a valid DTS file.
M2TS, 2 video tracks, 5 audio tracks, 1:41:00
1: Chapters, 16 chapters
2: h264/AVC, 1080p24 /1.001 (16:9)
3: h264/AVC, 480p24 /1.001 (20:11)
4: TrueHD/AC3, English, 5.1 channels, 48khz
5: TrueHD/AC3, French, 5.1 channels, 48khz
6: AC3, Spanish, 5.1 channels, 448kbit/s, 48khz, dialnorm: -29dB
7: AC3, Portuguese, 5.1 channels, 448kbit/s, 48khz, dialnorm: -30dB
8: AC3, English, 2.0 channels, 192kbit/s, 48khz, dialnorm: -30dB

It converted and played fine, so

[Snowknight26]

If it says the DTS track is invalid, it won't show up in the stream list, even if it is present.

It might be playing fine because you are converting the other audio tracks instead of the DTS track.